A CSTR is used for the reaction A+B->C. A is fed to the reactor at 50 oC, B is fed at 100 oC, and an inert feed at 20oC is also added. When running properly, the reactor should operate between 150 and 160 oC. Cooling water at 20 oC flows through a jacket around the reactor at a sufficiently high flowrate that its temperature rise is negligible. The average ambient air temperature is 0oC. The reactor operator drinks 60 oC coffee in the morning and 5oC pop in the afternoon. The following property data is available for A, B, and C: Heats of formation at 293 K, heat capacities as a function of temperature that are valid over the range 0-250 oC, and thermal conductivities at 100 oC.

Based on the information given, which temperature values should be used in a reactor energy balance and where. Explain.